How many grams of ammonia are recquired to produce 16 liters of nitrogen gas?

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6

Condensation happens when water vapor cools. true or false? ?

How many grams are in 68.2 molecules of br2?